EP0841184B1 - Stencil forming apparatus - Google Patents
Stencil forming apparatus Download PDFInfo
- Publication number
- EP0841184B1 EP0841184B1 EP97118962A EP97118962A EP0841184B1 EP 0841184 B1 EP0841184 B1 EP 0841184B1 EP 97118962 A EP97118962 A EP 97118962A EP 97118962 A EP97118962 A EP 97118962A EP 0841184 B1 EP0841184 B1 EP 0841184B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- stencil
- stencil sheet
- forming apparatus
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007639 printing Methods 0.000 claims description 53
- 238000004804 winding Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007651 thermal printing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
- B41L29/00—Devices for attaching printing elements or formes to supports
- B41L29/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41L29/14—Clamping devices
- B41L29/16—Clamping devices operating automatically during operation of rotary machines to attach the printing formes to the forme cylinders
Definitions
- This invention relates to a stencil forming apparatus which make minute holes on a stencil pulled out from a rolled stencil sheet.
- FIG. 7 shows a conventional stencil forming apparatus.
- a stencil printing sheet S for the stencil printing (hereinafter referred to merely as "a stencil sheet S) which is in the form of a roll is held by a master holder 106.
- a stencil sheet S pulled out of a rolled stencil sheet S is in the form of a belt.
- the stencil sheet S is laid over a set guide shaft 100 to change the direction of its movement, and inserted between a thermal printing head (TPH) 101 and a platen roller 103, and then laid over a winding roller 103. Furthermore the stencil sheet S is inserted between an upper load roller 104 and a lower load roller 105, thus being conveyed to an initial stop position.
- TPH thermal printing head
- a back tension unit 107 of the master holder 106 applies tension to the stencil sheet S in the direction which is opposite to the direction of conveyance of the stencil sheet S.
- the thermal head 101 thermally makes fine holes on the stencil sheet S
- the power of conveying the stencil sheet S is provided by the platen roller 102 only which holds the stencil sheet S with the thermal head 101.
- the stencil sheet S thus formed is moved downwardly into a holding box 108 by means of the winding roller 103. Until the thermal cutting of the stencil sheet S is accomplished by the thermal head 101, the stencil sheet S thus cut is temporarily held (stored) in the holding box 108.
- the latter 101 is moved upwardly to release the stencil sheet S.
- the front end portion of the stencil sheet S thus released is conveyed to a clamp board 110 on a printing drum 109 by means of the upper and lower load rollers 104, so that the front end portion of the stencil sheet S is secured to a printing drum 109 with the clamp board 110.
- the upper and lower load rollers 104 and 105 are turned to convey the stencil sheet S so that the sheet S is wound on the printing drum.
- the stencil sheet S is cut off with a cutter unit 111.
- the above-described stencil forming apparatus serves also as a stencil printing machine. Part of the structure of the stencil printing machine is shown in the drawings. A part of the cylindrical wall of the printing drum 109 is ink-permeable. An ink supplying means for supplying ink to the inner surface of the printing drum 109 is provided inside the drum 109. A pressing means, namely, a press roller is provided below the printing drum to press a printing sheet against the printing drum 109. The printing drum 109 is turned, while a printing sheet is fed into the space between the printing drum 109 and the pressing means, so that the printing sheet is pressed against the image region of the stencil sheet S wound on the printing drum 109. The printing ink supplied from the inner cylindrical surface of the printing drum 109 passes through the cylindrical wall of the printing drum 109, and transfers through the cuts of the stencil sheet S onto the printing sheet to form an image thereon.
- the conventional stencil forming apparatus shown in FIG. 7 suffers from the following difficulties: Because the set guide shaft 100 and the platen roller 102 are not in parallel with each other, the stencil sheet S being conveyed is liable to slacken, and, when the stencil sheet S is cut, it is liable to be creased.
- an object of the invention is to provide a stencil forming apparatus in which, in the formation of a printing stencil, the stencil sheet S is not creased.
- the present invention provides a stencil forming apparatus in which a stencil for a stencil printing formed from a rolled stencil sheet, the stencil forming apparatus comprising: a guide roller; a rotatable platen roller having a central axis which is in parallel with said guide roller; a thermal head having a plurality of heat generating elements, and provided above the platen roller, wherein the stencil sheet pulled out of the rolled stencil sheet is passed through the platen roller and the thermal head through the a guide roller and is subjected to thermally making fine holes thereon the stencil of the stencil printing; and an intermediate roller provided between the platen roller and the guide roller wherein the intermediate roller is vertically movable in a predetermined range.
- the intermediate roller is arranged between the platen roller and the guide roller such that the intermediate roller is closer to the platen roller.
- the intermediate roller is brought into contact with the surface of the stencil sheet which is in contact with the thermal head.
- FIGS. 1 through 6 A stencil forming apparatus, which constitutes a preferred embodiment of the invention, will be described with reference to FIGS. 1 through 6.
- reference numeral 1 designates the stencil forming apparatus.
- the stencil forming apparatus 1 has a stencil forming function of thermally forming a stencil sheet S with a thermal head, and a printing function of printing an image on a printing sheet through the stencil sheet S.
- a printing drum 3 is provided inside a body frame 2.
- the printing drum 3 includes: a cylindrical wall 4 at least a part of which is ink-permeable; a fixing means, namely, a clamp board 5 which is provided on the outer cylindrical surface of the cylindrical wall 4; and an ink supplying means (not shown) which is provided inside the cylindrical wall 4 to supply ink to the inner cylindrical surface of the cylindrical wall 4.
- the printing drum 3 is driven to rotate around its own rotary shaft 6 set at a predetermined position.
- a pressing means namely, a press roller (not shown) is provided to press a printing sheet against the printing drum 3.
- a master holder 7 is provided inside a body frame 1, which accommodates a roll of stencil sheet S in such a manner that the roll is rotatable.
- the stencil sheet S is obtained by bonding a porous support member to a heat-sensitive film.
- the upper surface of the body frame 2 is partially opened.
- a stencil pressing frame is swingably provided with the aid of a supporting shaft 9.
- a nip roller 10 Between the master holder 7 and the printing drum 3, a nip roller 10, a tension roller 11, a set guide shaft 12, an intermediate roller 13, a platen roller 14, a thermal head 15 (hereinafter referred to as "a TPH 15", when applicable), a winding roller 16, upper and lower load roller 17 and 18, and a cutter unit in the stated order as viewed from the master holder 7.
- the stencil sheet S is conveyed passing through those rollers, and is thermally cut with the TPH 15.
- a holding (storing) box 20 is provided below the platen roller 14, the TPH 15, and the winding roller 16. The holding box 20 is to temporarily hold the stencil sheet S which has been thermally cut.
- the nip roller 10 and the tension roller 11 are mounted on the body frame 2 (however, the nip roller 10 may be mounted on the stencil pressing plate 8).
- the cylindrical surface of the tension roller 11, as shown in FIG. 5, is made of high-friction material, or surface-treated so as to be high in friction, so that the stencil sheet S scarcely slips.
- the shaft 21 of the tension roller 11 is rotatably supported at a predetermined position inside the body frame 2.
- the shaft 21 of the tension roller 11 is provided with a torque limiter. Hence, in the conveyance of the stencil sheet S, the tension roller 11 will never idle; that is, a predetermined torque is applied thereto.
- the nip roller 10 is provided on the tension roller 11.
- a horizontal supporting board 23 is secured to the body frame 2 (however, the supporting board 23 may be secured to the stencil pressing frame 8).
- the supporting board 23 has right and left side boards 24 at both ends in such a manner that those boards 24 are extended downwardly.
- Each of the side boards 24 has a vertically elongated hole 25.
- Both end portions of the shaft 26 of the nip roller 10 is movably engaged with the elongated holes 25, respectively.
- the nip roller 10 is vertically movable along the elongated holes 25.
- the nip roller 10 is brought into contact with the tension roller 11 by its own weight.
- an urging means 29 comprising a compression spring 27 and a pressing body 28 may be provided on or near each of the side boards 24, to urge the both ends of the shaft 26 of the nip roller 10 downwardly so that the latter 10 is in contact with the tension roller 11.
- the torque limiter 22 is mounted on the shaft of the tension roller 11. Hence, the stencil sheet S held between the tension roller 11 and the nip roller is passed through the platen roller 14 and the TPH 15 under the condition that a predetermined tension is applied thereto, irrespective of the diameter of the roll of stencil sheet S in the master holder 7.
- the TPH 15 is mounted on the stencil pressing frame 8. As shown in FIGS. 2 and 3, the TPH 15 is elongated-plate-shaped, and it is laid in parallel with the direction of width of the stencil sheet S conveyed and is in contact with the upper surface of the stencil sheet S.
- the TPH 15 is driven by a drive mechanism (not shown) to move to and from the platen roller 14. More specifically, when the stencil sheet S is subjected to making fine holes, the TPH 15 is brought into contact with the platen roller 14, and after the stencil sheet S has been formed, the TPH 15 is moved away from the platen roller 14 by a TPH lifting mechanism (not shown).
- the TPH has a plurality of heat generating elements which are arranged in parallel with the direction of width of the stencil sheet S. That is, the stencil sheet S is thermally formed with heat generated thereby.
- the platen roller 14 is provided in the body frame 2 located below the TPH 15.
- the stencil pressing frame 8 is closed, the TPH 15 provided on the latter 8 is brought into contact with the platen roller 14 mounted on the body frame 2.
- the stencil sheet S held between the TPH 15 and the platen roller 14, while being conveyed by the roller 14, is subjected to making fine holes by heat generated by the heat generating elements of the TPH 15.
- the TPH 15 has TPH pawls 30 at both ends.
- the TPH pawls 30 are engaged with the shaft 36 of the platen roller 14, so that the platen roller 14 is positioned with respect to the TPH 15.
- Each of the TPH pawls 30 has a vertically elongated hole 31, with which both end portions of the shaft 32 of the intermediate roller 13 are movably engaged.
- the roller 13 is movable vertically along the elongated holes 31.
- a set guide shaft 12 is provided as a stencil sheet guide roller. However, the set guide shaft 12 may be secured to the body frame 2.
- the intermediate roller 13 serves to sag the stencil sheet platent roller 14, nunder its own weight.
- round holes 33 may be employed instead of the elongated holes 31 formed in the TPH pawls 30, round holes 33 may be employed.
- the diameter of the round holes 33 is larger than the diameter of the shaft 32 of the intermediate roller 13, and therefore the shaft 32 of the intermediate roller 12 is vertically and horizontally movable in the round holes 33.
- the winding roller 16 and the upper load roller 17 are vertically movably and rotatably engaged with vertically elongated holes 34 and 35, respectively.
- the stencil sheet S is laid over the above-described rollers.
- the stencil pressing frame 8 is opened. A belt-shaped stencil sheet S is pulled out of a roll of stencil sheet S accommodated in the master holder 7. The stencil sheet S thus pulled out is inserted into between the nip roller 10 and the tension roller 11. Thereafter, the stencil sheet S is laid over the set guide shaft 12, the platen roller 14, and the lower load roller 18 (thus being in contact with the upper parts of the cylindrical surfaces of those roller). Under this condition, the stencil pressing frame 8 is closed, to hold the stencil sheet S between the TPH 15 and the platen roller 14.
- image data are applied to the TPH 15.
- the TPH 15 forms an image on the stencil sheet S (held between the TPH 15 and the platen roller 14) thermally according to the image data.
- the stencil sheet S is conveyed by the drive force of the platen roller 14.
- the direction of movement of the stencil sheet S thus processed is bent downwardly by the winding roller 16, and led into the holding (storing) box. Until a series of stencil forming operations are accomplished, the stencil sheet S thus formed is accommodated (stored) in the holding box 20.
- the stencil sheet S which is pulled out of the rolled stencil sheet S and conveyed is held between the tension roller 11 and the nip roller 10, and therefore it is conveyed to the TPH 15 while being tensed to some extent at all times.
- the intermediate roller 13 slackens the stencil sheet S by its own weight which is laid over the set guide shaft 12 and the platen roller 14.
- a certain tension is applied to the stencil sheet S by the nip roller 10 and the tension roller 11, and the intermediate roller 13 is vertically movable and is in contact with the stencil sheet S from above.
- the intermediate roller 13 is raised by the stencil sheet S to which the certain tension is applied, and therefore the shaft 32 of the intermediate roller 13 is raised above the lower ends of the elongated holes 31.
- the shaft 32 of the intermediate roller 13 is automatically held in parallel with the central axis of the platen roller 14. Therefore, the stencil sheet S thus conveyed is not slackened, and the stencil sheet S which is subjected to thermally making fine holes is scarcely creased.
- a printing operation is carried out.
- the TPH 15 is moved upwardly to move away from the platen roller 14. That is, the holding of the stencil sheet S by the TPH 15 and the platen roller 14 is eliminated.
- the front end of the stencil sheet S on which images have been formed by thermal cutting is sent to the clamp board 5 by the upper and lower load rollers 17 and 18, and the front end of the stencil sheet S is fixed to the printing drum 3 with the clamp board 5.
- the upper and lower load rollers 17 and 18 rotate to convey the stencil sheet S, while the printing drum 3 rotates, so that the stencil sheet S is wound on the printing drum 3 (a stencil winding operation). Thereafter, the stencil sheet S is cut off with a cutter unit 19, to leave the stencil on the printing drum.
- the printing drum 3 While the printing drum 3 is turned, a printing sheet is fed into the space between the printing drum 3 and the pressing means. As a result, the pressing means presses the printing sheet against the image region of the stencil sheet S (the stencil) wound on the printing drum 3.
- the printing ink supplied through the inner cylindrical surface of the printing drum 3 passes through the cylindrical wall 4 of the printing drum 3, thus being transferring onto the printing sheet through the thermally process region of the stencil sheet S.
- the stencil image is formed on the printing sheet.
- the intermediate roller brought into the upper surface of a stencil sheet is vertically movably provided in front of the platen roller, and therefore the intermediate roller is raised by the stencil sheet which is being conveyed while being tensed.
- the intermediate roller and the platen roller are automatically placed in parallel with each other, and the stencil sheet which is thermally cut with the thermal head and the platen roller is scarcely creased.
Description
- This invention relates to a stencil forming apparatus which make minute holes on a stencil pulled out from a rolled stencil sheet.
- FIG. 7 shows a conventional stencil forming apparatus. A stencil printing sheet S for the stencil printing (hereinafter referred to merely as "a stencil sheet S) which is in the form of a roll is held by a
master holder 106. A stencil sheet S pulled out of a rolled stencil sheet S is in the form of a belt. The stencil sheet S is laid over aset guide shaft 100 to change the direction of its movement, and inserted between a thermal printing head (TPH) 101 and aplaten roller 103, and then laid over awinding roller 103. Furthermore the stencil sheet S is inserted between anupper load roller 104 and alower load roller 105, thus being conveyed to an initial stop position. - In order that, when the stencil sheet S is conveyed, the part of the sheet which is held between the
thermal head 101 and theplaten roller 102 may not be creased, aback tension unit 107 of themaster holder 106 applies tension to the stencil sheet S in the direction which is opposite to the direction of conveyance of the stencil sheet S. - When the
thermal head 101 thermally makes fine holes on the stencil sheet S, the power of conveying the stencil sheet S is provided by theplaten roller 102 only which holds the stencil sheet S with thethermal head 101. The stencil sheet S thus formed is moved downwardly into aholding box 108 by means of thewinding roller 103. Until the thermal cutting of the stencil sheet S is accomplished by thethermal head 101, the stencil sheet S thus cut is temporarily held (stored) in theholding box 108. - After the stencil sheet S has been formed with the
thermal head 101, the latter 101 is moved upwardly to release the stencil sheet S. The front end portion of the stencil sheet S thus released is conveyed to aclamp board 110 on aprinting drum 109 by means of the upper andlower load rollers 104, so that the front end portion of the stencil sheet S is secured to aprinting drum 109 with theclamp board 110. As theprinting drum 109 turns, the upper andlower load rollers cutter unit 111. - The above-described stencil forming apparatus serves also as a stencil printing machine. Part of the structure of the stencil printing machine is shown in the drawings. A part of the cylindrical wall of the
printing drum 109 is ink-permeable. An ink supplying means for supplying ink to the inner surface of theprinting drum 109 is provided inside thedrum 109. A pressing means, namely, a press roller is provided below the printing drum to press a printing sheet against theprinting drum 109. Theprinting drum 109 is turned, while a printing sheet is fed into the space between theprinting drum 109 and the pressing means, so that the printing sheet is pressed against the image region of the stencil sheet S wound on theprinting drum 109. The printing ink supplied from the inner cylindrical surface of theprinting drum 109 passes through the cylindrical wall of theprinting drum 109, and transfers through the cuts of the stencil sheet S onto the printing sheet to form an image thereon. - The conventional stencil forming apparatus shown in FIG. 7 suffers from the following difficulties: Because the
set guide shaft 100 and theplaten roller 102 are not in parallel with each other, the stencil sheet S being conveyed is liable to slacken, and, when the stencil sheet S is cut, it is liable to be creased. - In view of the foregoing, an object of the invention is to provide a stencil forming apparatus in which, in the formation of a printing stencil, the stencil sheet S is not creased.
- The present invention provides a stencil forming apparatus in which a stencil for a stencil printing formed from a rolled stencil sheet, the stencil forming apparatus comprising: a guide roller; a rotatable platen roller having a central axis which is in parallel with said guide roller; a thermal head having a plurality of heat generating elements, and provided above the platen roller, wherein the stencil sheet pulled out of the rolled stencil sheet is passed through the platen roller and the thermal head through the a guide roller and is subjected to thermally making fine holes thereon the stencil of the stencil printing; and an intermediate roller provided between the platen roller and the guide roller wherein the intermediate roller is vertically movable in a predetermined range.
- Furhtermore, in the stencil forming apparatus described above, the intermediate roller is arranged between the platen roller and the guide roller such that the intermediate roller is closer to the platen roller.
- Still further, in the stencil forming apparatus described above, between the platen roller and the guide roller, the intermediate roller is brought into contact with the surface of the stencil sheet which is in contact with the thermal head.
-
- FIG. 1 is a sectional view showing a stencil forming apparatus, which constitutes an embodiment of the invention;
- FIGS. 2 and 3 are a perspective view and a side view, respectively, showing an arrangement of a thermal head and its relevant components in the embodiment of the invention;
- FIG. 4 is a side view showing another arrangement of the thermal head (TPH) and its relevant components in the embodiment of the invention;
- FIG. 5 is a perspective view showing an arrangement of a tension roller and its relevant components in the embodiment of the invention;
- FIG. 6 is a perspective view showing another arrangement of the tension roller and its relevant components in the embodiment of the invention;
- FIG. 7 is a sectional view showing an example of a conventional stencil forming apparatus.
-
- A stencil forming apparatus, which constitutes a preferred embodiment of the invention, will be described with reference to FIGS. 1 through 6.
- In those figure,
reference numeral 1 designates the stencil forming apparatus. Thestencil forming apparatus 1 has a stencil forming function of thermally forming a stencil sheet S with a thermal head, and a printing function of printing an image on a printing sheet through the stencil sheet S. As shown in FIG. 1, aprinting drum 3 is provided inside abody frame 2. Theprinting drum 3 includes: a cylindrical wall 4 at least a part of which is ink-permeable; a fixing means, namely, aclamp board 5 which is provided on the outer cylindrical surface of the cylindrical wall 4; and an ink supplying means (not shown) which is provided inside the cylindrical wall 4 to supply ink to the inner cylindrical surface of the cylindrical wall 4. Theprinting drum 3 is driven to rotate around its own rotary shaft 6 set at a predetermined position. Below theprinting drum 3, a pressing means, namely, a press roller (not shown) is provided to press a printing sheet against theprinting drum 3. - A
master holder 7 is provided inside abody frame 1, which accommodates a roll of stencil sheet S in such a manner that the roll is rotatable. The stencil sheet S is obtained by bonding a porous support member to a heat-sensitive film. In the stencil forming apparatus, the upper surface of thebody frame 2 is partially opened. In this open part, a stencil pressing frame is swingably provided with the aid of a supportingshaft 9. Between themaster holder 7 and theprinting drum 3, anip roller 10, atension roller 11, aset guide shaft 12, anintermediate roller 13, aplaten roller 14, a thermal head 15 (hereinafter referred to as "aTPH 15", when applicable), awinding roller 16, upper andlower load roller 17 and 18, and a cutter unit in the stated order as viewed from themaster holder 7. The stencil sheet S is conveyed passing through those rollers, and is thermally cut with theTPH 15. Inside thebody frame 1, a holding (storing)box 20 is provided below theplaten roller 14, theTPH 15, and thewinding roller 16. Theholding box 20 is to temporarily hold the stencil sheet S which has been thermally cut. - The
nip roller 10 and thetension roller 11 are mounted on the body frame 2 (however, thenip roller 10 may be mounted on the stencil pressing plate 8). The cylindrical surface of thetension roller 11, as shown in FIG. 5, is made of high-friction material, or surface-treated so as to be high in friction, so that the stencil sheet S scarcely slips. Theshaft 21 of thetension roller 11 is rotatably supported at a predetermined position inside thebody frame 2. Theshaft 21 of thetension roller 11 is provided with a torque limiter. Hence, in the conveyance of the stencil sheet S, thetension roller 11 will never idle; that is, a predetermined torque is applied thereto. - As shown in FIG. 5, the
nip roller 10 is provided on thetension roller 11. A horizontal supportingboard 23 is secured to the body frame 2 (however, the supportingboard 23 may be secured to the stencil pressing frame 8). The supportingboard 23 has right andleft side boards 24 at both ends in such a manner that thoseboards 24 are extended downwardly. Each of theside boards 24 has a verticallyelongated hole 25. Both end portions of theshaft 26 of thenip roller 10 is movably engaged with theelongated holes 25, respectively. Hence, thenip roller 10 is vertically movable along theelongated holes 25. In the embodiment, thenip roller 10 is brought into contact with thetension roller 11 by its own weight. - Alternately, as shown in FIG. 6, an
urging means 29 comprising acompression spring 27 and apressing body 28 may be provided on or near each of theside boards 24, to urge the both ends of theshaft 26 of thenip roller 10 downwardly so that the latter 10 is in contact with thetension roller 11. - The
torque limiter 22 is mounted on the shaft of thetension roller 11. Hence, the stencil sheet S held between thetension roller 11 and the nip roller is passed through theplaten roller 14 and theTPH 15 under the condition that a predetermined tension is applied thereto, irrespective of the diameter of the roll of stencil sheet S in themaster holder 7. - As shown in FIG. 1, the
TPH 15 is mounted on the stencilpressing frame 8. As shown in FIGS. 2 and 3, theTPH 15 is elongated-plate-shaped, and it is laid in parallel with the direction of width of the stencil sheet S conveyed and is in contact with the upper surface of the stencil sheet S. TheTPH 15 is driven by a drive mechanism (not shown) to move to and from theplaten roller 14. More specifically, when the stencil sheet S is subjected to making fine holes, theTPH 15 is brought into contact with theplaten roller 14, and after the stencil sheet S has been formed, theTPH 15 is moved away from theplaten roller 14 by a TPH lifting mechanism (not shown). The TPH has a plurality of heat generating elements which are arranged in parallel with the direction of width of the stencil sheet S. That is, the stencil sheet S is thermally formed with heat generated thereby. - The
platen roller 14 is provided in thebody frame 2 located below theTPH 15. When the stencilpressing frame 8 is closed, theTPH 15 provided on the latter 8 is brought into contact with theplaten roller 14 mounted on thebody frame 2. The stencil sheet S held between theTPH 15 and theplaten roller 14, while being conveyed by theroller 14, is subjected to making fine holes by heat generated by the heat generating elements of theTPH 15. - As shown in FIGS. 2 and 3, the
TPH 15 has TPHpawls 30 at both ends. As shown in FIG. 1 and 3, the TPH pawls 30 are engaged with theshaft 36 of theplaten roller 14, so that theplaten roller 14 is positioned with respect to theTPH 15. Each of the TPH pawls 30 has a verticallyelongated hole 31, with which both end portions of theshaft 32 of theintermediate roller 13 are movably engaged. Theroller 13 is movable vertically along the elongated holes 31. In front of theintermediate shaft 13, aset guide shaft 12 is provided as a stencil sheet guide roller. However, theset guide shaft 12 may be secured to thebody frame 2. Theintermediate roller 13 serves to sag the stencilsheet platent roller 14, nunder its own weight. - As shown in FIG. 4, instead of the
elongated holes 31 formed in the TPH pawls 30, round holes 33 may be employed. In this case, the diameter of the round holes 33 is larger than the diameter of theshaft 32 of theintermediate roller 13, and therefore theshaft 32 of theintermediate roller 12 is vertically and horizontally movable in the round holes 33. - As shown in FIG. 1, the winding
roller 16 and the upper load roller 17 are vertically movably and rotatably engaged with vertically elongatedholes 34 and 35, respectively. - The printing stencil forming operation of the above-described apparatus will be described.
- The stencil sheet S is laid over the above-described rollers. First, the stencil
pressing frame 8 is opened. A belt-shaped stencil sheet S is pulled out of a roll of stencil sheet S accommodated in themaster holder 7. The stencil sheet S thus pulled out is inserted into between thenip roller 10 and thetension roller 11. Thereafter, the stencil sheet S is laid over theset guide shaft 12, theplaten roller 14, and the lower load roller 18 (thus being in contact with the upper parts of the cylindrical surfaces of those roller). Under this condition, the stencilpressing frame 8 is closed, to hold the stencil sheet S between theTPH 15 and theplaten roller 14. - In forming a stencil, image data are applied to the
TPH 15. TheTPH 15 forms an image on the stencil sheet S (held between theTPH 15 and the platen roller 14) thermally according to the image data. During thermally forming, the stencil sheet S is conveyed by the drive force of theplaten roller 14. The direction of movement of the stencil sheet S thus processed is bent downwardly by the windingroller 16, and led into the holding (storing) box. Until a series of stencil forming operations are accomplished, the stencil sheet S thus formed is accommodated (stored) in theholding box 20. - In the above-described stencil forming operation, the stencil sheet S which is pulled out of the rolled stencil sheet S and conveyed, is held between the
tension roller 11 and thenip roller 10, and therefore it is conveyed to theTPH 15 while being tensed to some extent at all times. - The
intermediate roller 13 slackens the stencil sheet S by its own weight which is laid over theset guide shaft 12 and theplaten roller 14. As was described above, during a stencil forming operation, a certain tension is applied to the stencil sheet S by thenip roller 10 and thetension roller 11, and theintermediate roller 13 is vertically movable and is in contact with the stencil sheet S from above. Hence, during the conveyance of the stencil sheet S, theintermediate roller 13 is raised by the stencil sheet S to which the certain tension is applied, and therefore theshaft 32 of theintermediate roller 13 is raised above the lower ends of the elongated holes 31. Hence, theshaft 32 of theintermediate roller 13 is automatically held in parallel with the central axis of theplaten roller 14. Therefore, the stencil sheet S thus conveyed is not slackened, and the stencil sheet S which is subjected to thermally making fine holes is scarcely creased. - After a stencil is formed in the above-described manner, a printing operation is carried out. The
TPH 15 is moved upwardly to move away from theplaten roller 14. That is, the holding of the stencil sheet S by theTPH 15 and theplaten roller 14 is eliminated. The front end of the stencil sheet S on which images have been formed by thermal cutting is sent to theclamp board 5 by the upper andlower load rollers 17 and 18, and the front end of the stencil sheet S is fixed to theprinting drum 3 with theclamp board 5. The upper andlower load rollers 17 and 18 rotate to convey the stencil sheet S, while theprinting drum 3 rotates, so that the stencil sheet S is wound on the printing drum 3 (a stencil winding operation). Thereafter, the stencil sheet S is cut off with acutter unit 19, to leave the stencil on the printing drum. - While the
printing drum 3 is turned, a printing sheet is fed into the space between theprinting drum 3 and the pressing means. As a result, the pressing means presses the printing sheet against the image region of the stencil sheet S (the stencil) wound on theprinting drum 3. The printing ink supplied through the inner cylindrical surface of theprinting drum 3 passes through the cylindrical wall 4 of theprinting drum 3, thus being transferring onto the printing sheet through the thermally process region of the stencil sheet S. Thus, the stencil image is formed on the printing sheet. - In the stencil forming apparatus of the invention, the intermediate roller brought into the upper surface of a stencil sheet is vertically movably provided in front of the platen roller, and therefore the intermediate roller is raised by the stencil sheet which is being conveyed while being tensed. Hence, the intermediate roller and the platen roller are automatically placed in parallel with each other, and the stencil sheet which is thermally cut with the thermal head and the platen roller is scarcely creased.
Claims (7)
- A stencil forming apparatus in which a stencil for a stencil printing formed from a rolled stencil sheet, the stencil forming apparatus comprising:a guide roller;a platen roller having a central axis which is in parallel with said guide roller;a thermal head having a plurality of heat generating elements, and provided above the platen roller, wherein the stencil sheet pulled out of the rolled stencil sheet is passed through the guide roller to the platen roller and the thermal head and is subjected to thermally making fine holes thereon printing; andan intermediate roller provided between the platen roller and the guide roller wherein the intermediate roller is vertically movable in a predetermined range.
- The stencil forming apparatus according to claim 1, wherein the intermediate roller is arranged between the platen roller and the guide roller such that the intermediate roller is closer to the platen roller.
- The stencil forming apparatus according to claim 1, wherein between the platen roller and the guide roller, the intermediate roller is brought into contact with the surface of the stencil sheet which is in contact with the thermal head.
- The stencil forming apparatus according to claim 1, further comprising:
thermal head pawls attached to the thrmal head, each having a elongated hole into which the intermediate roller is slidably inserted. - The stencil forming apparatus according to claim 4, wherein the intermediate roller is supported by only the thermal head pawls
- The stencil forming apparatus according to claim 1, further comprising:
thermal head pawls attached to the thrmal head, each having a round hole into which the intermediate roller is slidably insreted. - The stencil forming appratus according to claim 6, wherein the intermediate roler is supported by only the thermal head palws.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28853296 | 1996-10-30 | ||
JP288532/96 | 1996-10-30 | ||
JP8288532A JPH10128946A (en) | 1996-10-30 | 1996-10-30 | Plate making apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0841184A1 EP0841184A1 (en) | 1998-05-13 |
EP0841184B1 true EP0841184B1 (en) | 2000-02-02 |
Family
ID=17731465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97118962A Expired - Lifetime EP0841184B1 (en) | 1996-10-30 | 1997-10-30 | Stencil forming apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US5893324A (en) |
EP (1) | EP0841184B1 (en) |
JP (1) | JPH10128946A (en) |
DE (1) | DE69701249T2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11309833A (en) | 1998-04-30 | 1999-11-09 | Riso Kagaku Corp | Plate making apparatus |
JP4346760B2 (en) * | 1999-11-30 | 2009-10-21 | 東北リコー株式会社 | Plate making and feeding apparatus in printing apparatus |
JP3817116B2 (en) * | 2000-06-15 | 2006-08-30 | 理想科学工業株式会社 | Stencil printing machine |
JP3934350B2 (en) | 2001-02-08 | 2007-06-20 | 富士フイルム株式会社 | Thermal development device |
US6641314B2 (en) * | 2001-03-09 | 2003-11-04 | Fuji Photo Film Co., Ltd. | Color thermal printer having tension roller |
US20070146756A1 (en) * | 2005-12-28 | 2007-06-28 | Ahne Adam J | Method of operating an imaging apparatus having a duplexer and a perforation device |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3889595A (en) * | 1972-07-03 | 1975-06-17 | Precision Screen Machines | Continuous rotary screen printing method and apparatus |
US4051776A (en) * | 1974-03-13 | 1977-10-04 | Johannes Zimmer | Downstream web tensioning for rotary screen printer |
JPS5996983A (en) * | 1982-11-26 | 1984-06-04 | Riso Kagaku Corp | Mimeographic plate printer |
DE3815463A1 (en) * | 1988-05-06 | 1989-11-16 | Kuesters Eduard Maschf | METHOD FOR PRODUCING SMOOTH AND GLOSSY ON A PAPER RAIL AND CORRESPONDING CALANDER ARRANGEMENT |
JP3094300B2 (en) * | 1990-06-29 | 2000-10-03 | 株式会社日立製作所 | Thermal transfer recording device |
EP0568219B1 (en) * | 1992-04-20 | 1996-09-18 | Riso Kagaku Corporation | Stencil printing method and master plate making printing device |
JP3272885B2 (en) * | 1994-10-11 | 2002-04-08 | 理想科学工業株式会社 | Rotary stencil printing press equipped with stiffening crease applying means |
-
1996
- 1996-10-30 JP JP8288532A patent/JPH10128946A/en active Pending
-
1997
- 1997-10-30 EP EP97118962A patent/EP0841184B1/en not_active Expired - Lifetime
- 1997-10-30 DE DE69701249T patent/DE69701249T2/en not_active Expired - Fee Related
- 1997-10-30 US US08/961,418 patent/US5893324A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0841184A1 (en) | 1998-05-13 |
DE69701249T2 (en) | 2000-07-13 |
DE69701249D1 (en) | 2000-03-09 |
US5893324A (en) | 1999-04-13 |
JPH10128946A (en) | 1998-05-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4910602A (en) | Thermal recorder with ink sheet cassette removably mounted in openable housing | |
JP2535477Y2 (en) | Thermal recording device | |
EP0841184B1 (en) | Stencil forming apparatus | |
US6877918B2 (en) | Mechanism for adjusting tension of an inked ribbon of a printer | |
EP0873002B1 (en) | Supporting device for rolled recording sheet | |
GB2372724A (en) | Mechanism for adjusting tension of an inked ribbon of a printer | |
US6520078B1 (en) | Stencil printing machine | |
JP3720679B2 (en) | Paper feeding device and stencil printing device using the same | |
JP3765867B2 (en) | Label printer with paper cassette | |
JP2843238B2 (en) | Plate making and plate feeding equipment for printing press | |
JPS6221566A (en) | Image recorder | |
JP3479387B2 (en) | Plate making and printing equipment | |
JP2001080154A (en) | Recording apparatus | |
EP0953442B1 (en) | Stencil making device | |
CN213415742U (en) | Automatic send rolling overspeed device tensioner and gilding press | |
JP3635213B2 (en) | Plate making equipment | |
JP3259934B2 (en) | Thermal transfer recording device | |
JPS63114691A (en) | Thermal stencil paper | |
JPH0330354Y2 (en) | ||
JP3701803B2 (en) | Recording device tensioning device | |
JPS62270346A (en) | Thermal head holder | |
JPH02273Y2 (en) | ||
JPH0351589B2 (en) | ||
JPH0245991B2 (en) | ||
JP2002255420A (en) | Recorder |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19971030 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;RO;SI |
|
AKX | Designation fees paid |
Free format text: DE FR GB |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19990511 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
REF | Corresponds to: |
Ref document number: 69701249 Country of ref document: DE Date of ref document: 20000309 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20081027 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20081014 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20081029 Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20100630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091102 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100501 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091030 |